Fix requires_floating_ip
Fix requires_floating_ip

This isn't a required piece of the config, so it might be unset. Use get
instead of [].

Change-Id: I1bbbcb4ac63a4f6d4399c0fa8881c21264a03e4b

openstack/python-openstacksdk,dtroyer/python-openstacksdk,dtroyer/python-openstacksdk,stackforge/python-openstacksdk,stackforge/python-openstacksdk,openstack/os-client-config,dtroyer/os-client-config,openstack/python-openstacksdk